Webster's Dictionary 
(1): ( n.) The principal goddess worshiped by the Egyptians. She was regarded as the mother of Horus, and the sister and wife of Osiris. The Egyptians adored her as the goddess of fecundity, and as the great benefactress of their country, who instructed their ancestors in the art of agriculture.
(2): ( n.) One of the asteroids.
(3): ( n.) Any coral of the genus Isis, or family Isidae, composed of joints of white, stony coral, alternating with flexible, horny joints. See Gorgoniacea.
The Nuttall Encyclopedia 
An Egyptian divinity, the wife and sister of Osiris and mother of Horus, the three together forming a trinity, which is characteristically Egyptian, and such as often repeats itself in Egyptian mythology, and typifying the life of the sun, Osiris representing that luminary slain at night and sorrowed over by his sister Isis, reviving in the morning in his son Horus, and wedded anew to his sister Isis as his wife; passed into the mythology of the Greeks, Isis became identified first with Demeter and then with the Moon, while in that of Rome she figures as the Universe-mother.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
Bibliography Information McClintock, John. Strong, James. Entry for 'Isis'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/i/isis.html. Harper & Brothers. New York. 1870.